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The *Classic* (Huangdi Neijing) states: "For pathogens located in the upper part, use the method of inducing vomiting to expel them." Whenever the Chi pulse (尺脉) is forceful and strong, emesis may be used. When food stagnation occurs in the Zhongwan region, causing abdominal distension, oppression, nausea, accompanied by headache and fever, and the Cun pulse (寸脉) is slippery and vigorous, emesis may be used. When phlegm-dampness fills the chest and diaphragm, obstructing the ascending and descending of Qi, leading to urinary retention, emesis may be used. When Liver Qi is constrained, causing pain and oppression in the Zhongwan region, emesis may be used. However, if the Chi pulse is weak and faint, the two Cun pulses are not slippery, and there is no oppression in the chest and diaphragm, emesis is contraindicated. If the Spleen and Stomach are inherently deficient, with a sallow complexion, and the Right Cun pulse is large but powerless, emesis is contraindicated. If Middle Qi is deficient, leading to fullness and distension due to failure of transformation and transportation, emesis must not be mistakenly applied. After emesis, as Heart Fire descends, the Yin channels become relatively strong (or Yin fluids are depleted leading to relative Yang hyperactivity); sexual intercourse and sorrow/worry are strictly prohibited to prevent other diseases; any resulting pathology is attributed to the error of emesis.

Whenever the pulse is floating and large, even if many days have passed since onset, if the pathogen remains in the exterior, sweating should be induced. If after six or seven days, the pathogenic heat has slightly subsided and the chest and diaphragm feel harmonious, indicating that both interior and exterior conditions have stabilized, yet the patient presents with dry throat and scanty sweating, this indicates exhaustion of Body Fluids; sweating is contraindicated, as it would lead to collapse of Yang. Furthermore, patients with Lin syndrome (strangury) cannot undergo sweating. Lin syndrome results from Heat transmitting from the Taiyang channel to the Bladder; sweating would further deplete Body Fluids, increase exogenous Heat, cause deficiency-dryness of the Bladder, and potentially lead to hematuria. Patients with frequent epistaxis (Nü jia) cannot undergo sweating, as epistaxis implies blood loss in the Upper Jiao; sweating would further exhaust Upper Jiao fluids, leading to malnourishment of sinews and inability to relax, and since Yin is already deficient, the eyes will fail to close, resulting in Spasm disease. In Shaoyin disease with a deep, fine, and rapid pulse, the pathology is in the interior, so sweating is contraindicated. In Shaoyin disease, if there is only cold extremities without sweat, forcing sweating will inevitably disturb the blood, causing bleeding from the mouth, nose, or eyes; this is termed "Lower Collapse and Upper Exhaustion," which is difficult to treat. A pulse that is moving, rapid, yet weak is contraindicated for sweating. A deep and slow pulse indicating interior pathology is contraindicated for sweating. Presence of pulsating sensations (Dong Qi) on either side of the abdomen is contraindicated for sweating. Similarly, postpartum women, patients with ulcers, the elderly, those with long-standing illness, and those with Qi or Blood deficiency are all contraindicated for sweating. Thus, sweating is a treatment for exterior patterns. However, there are three methods of sweating: First, Warm Dispersal. When encountering excessive cold or when internal organs are prone to Yin excess, if Yang Qi is insufficient to resolve the exterior, even with high fever, acrid-warm herbs must be used. Second, Cool Resolution. When heat is intense, causing dryness in both interior and exterior, and Yin Qi fails to circulate, preventing natural sweating, acrid-cool herbs should be used. Third, Balanced Resolution. When the disease lies between Yin and Yang, neither warming nor cooling is appropriate; a balanced approach should be used solely to resolve the exterior. If sweating occurs but the pulse remains restless and vigorous, this represents the extreme of Yin pulses and indicates death. If the pulse remains restless but no sweat occurs, this represents the extreme of Yang pulses and indicates death. If sweat occurs and the pulse becomes calm, life is preserved.

When a patient's spirit appears externally agitated, they often sweat excessively and are irritable/restless because the Spirit has escaped outward, and Body Fluids are uncontrolled and leaking. As stated in the *Classic*: "When Yang is deficient, Yin invades; one must maintain internal stability to reverse the trend." Laozi said: "Know the masculine, keep to the feminine; know the white, keep to the black," which is truly an apt prescription for this condition. Regarding medication, one must select herbal properties that sink downward and have heavy flavors, ensuring their consistent use. This is like frequently watering a garden to prevent drought. Therefore, in Shanghan disease where heat persists beyond the transmission cycles, or when sweating was incomplete, decoction of Perilla Leaf (Zi Su Ye) can be poured into a large vessel, placed under blankets to inhale the steam to assist sweating, while internally administering acrid-cool medicines to facilitate sweating without damaging Yin substances.